What is the best sound system you ever heard?


I am curious to hear what in your opinion was the best system you ever heard..

Thx
ishkabibil
In recent memory it has to the Kerr Acoustic K320 speakers. Nothing spectacular, but nothing obviously wrong - no sibilance, no bleaching, no cabinet issues. Eminently listenable fuss free sound through a Pioneer CD and smartphone streaming no matter what they were asked to play. Not sure about the amp, but it was a large black box with handles on the front.

I should also mention being stunned by the spooky imaging and scary dynamics of the Avantgarde Trios some 15 years ago. System featured a (ridiculously) deep plattered turntable with a, wait for it, £5k cartridge! Amps were some exotic valve types.

It was almost a time machine experience, but the trouble was the young chap demonstrating only played some 1950’s Jazz and didn’t seem keen on trying anything else. I still recall him telling us that it cost £5 in stylus wear every time he played a record.
Having heard systems of price ranges going well into 6 figures, got to say it's still a remote facsimile of live. Moving beyond that, I think my system is pretty excellent. 
Nothing is more absurd than to compare recorded music to live, yet people do it all the time.
Easy for me to answer; this Magico/Solution system I described a few years back:

https://forum.audiogon.com/discussions/2c-hifi-epiphany-worlds-best-system

Nothing has come remotely close for me. Returning to the realms of reality, this is my current 2C analog/digital system that sounds and looks fantastic to me:

https://systems.audiogon.com/systems/7324
I have listened to many great systems over my 40 year quest for perfect sound. The one that stands out for me was the VAC room at Axpona last year, with the largest sound stage I ever saw.